A creatinine blood test is a medical test that measures the level of creatinine in the blood to evaluate kidney function.
Understanding Creatinine and Kidney Function
Creatinine is a waste product produced by the muscles during normal activity. Healthy kidneys filter creatinine from the blood and eliminate it through urine. When kidneys are not functioning properly, creatinine levels in the blood increase.
Why is this Test Important?
- Kidney Function Assessment: The primary use of a creatinine blood test is to assess how well your kidneys are working.
- Diagnosis and Monitoring: It helps diagnose kidney diseases and monitors the progress of kidney-related conditions.
- Medication Dosage Adjustment: Doctors may use creatinine levels to adjust medication dosages because some drugs are processed through the kidneys.
How is the Test Performed?
A blood sample is taken, usually from a vein in your arm, and sent to a laboratory for analysis. The lab measures the creatinine level in the blood serum.
Key Considerations
- Serum Creatinine Level: As stated in the reference, "A measurement of the serum creatinine level is often used to evaluate kidney function."
- Urine Test: Creatinine in the urine can also be measured through a urine test; however, the question specifically pertains to the blood test.
Test Interpretation
- Normal Levels: Normal creatinine levels vary based on age, sex, and muscle mass.
- Elevated Levels: High levels usually indicate impaired kidney function.
- Low Levels: Low creatinine levels are less common and typically are not a cause for concern, but should still be discussed with a physician to eliminate potential medical issues.
| Factor | Description |
|---|---|
| What is it? | A blood test to measure creatinine levels. |
| Purpose | Assessing kidney function. |
| Why test | Diagnose and monitor kidney-related conditions. |
| How it's done | Blood sample is taken and analyzed. |
